template< container-compatible-range<T> R >
void assign_range( R&& rg );
(since C++23)

Replaces elements in the container with a copy of each element in rg. Invalidate all references, pointers, and iterators referring to the elements of the container, and the past-the-end iterator. Each iterator in the range rg is dereferenced exactly once.

The behavior is undefined if rg overlaps with the container.


rg - an input_range with reference type convertible to the element type of the container
Type requirements
-std::assignable_from<T&, ranges::range_reference_t<R>> must be modeled. Otherwise, the program is ill-formed.
-T must be EmplaceConstructible into the container from *ranges::begin(rg). Otherwise, the behavior is undefined.

Return value



Feature-test macro Value Std Comment
__cpp_lib_containers_ranges 202202L (C++23) Ranges-aware construction and insertion


#include <algorithm>
#include <cassert>
#include <deque>
#include <list>
int main()
    const auto source = std::list{2, 7, 1};
    auto destination = std::deque{3, 1, 4};
    assert(std::ranges::equal(source, destination));

See also

inserts a range of elements
(public member function)
adds a range of elements to the beginning
(public member function)
adds a range of elements to the end
(public member function)
assigns values to the container
(public member function)

© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.